package com.jsmtr.rms.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.PreparedStatement;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
/**
 * @author: cyx
 * @description:
 * @date: Created in 2019/1/17 11:50
 * @modified by:
 */
public class TestDemo {
    public static Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            String url = "jdbc:oracle:thin:@localhost:1521:ORCL";
            String user = "rms";
            String pass = "rms";
            conn = DriverManager.getConnection(url, user, pass);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    public static void main(String[] args) {
        Connection conn = getConnection();
        String sql = "select * from duserapply a,duserresume u where u.id=a.rid(+)";
        PreparedStatement stmt;
        try {
            stmt = conn.prepareStatement(sql);
            ResultSet rs = stmt.executeQuery(sql);
            ResultSetMetaData data = rs.getMetaData();
            for (int i = 1; i <= data.getColumnCount(); i++) {
// 获得所有列的数目及实际列数
                int columnCount = data.getColumnCount();
// 获得指定列的列名
                String columnName = data.getColumnName(i);
// 获得指定列的列值
                int columnType = data.getColumnType(i);
// 获得指定列的数据类型名
                String columnTypeName = data.getColumnTypeName(i);
// 所在的Catalog名字
                String catalogName = data.getCatalogName(i);
// 对应数据类型的类
                String columnClassName = data.getColumnClassName(i);
// 在数据库中类型的最大字符个数
                int columnDisplaySize = data.getColumnDisplaySize(i);
// 默认的列的标题
                String columnLabel = data.getColumnLabel(i);
// 获得列的模式
                String schemaName = data.getSchemaName(i);
// 某列类型的精确度(类型的长度)
                int precision = data.getPrecision(i);
// 小数点后的位数
                int scale = data.getScale(i);
// 获取某列对应的表名
                String tableName = data.getTableName(i);
// 是否自动递增
                boolean isAutoInctement = data.isAutoIncrement(i);
// 在数据库中是否为货币型
                boolean isCurrency = data.isCurrency(i);
// 是否为空
                int isNullable = data.isNullable(i);
// 是否为只读
                boolean isReadOnly = data.isReadOnly(i);
// 能否出现在where中
                boolean isSearchable = data.isSearchable(i);
                System.out.println(columnCount);
                System.out.println("获得列" + i + "的字段名称:" + columnName);
                System.out.println("获得列" + i + "的类型,返回SqlType中的编号:"+ columnType);
                System.out.println("获得列" + i + "的数据类型名:" + columnTypeName);
                System.out.println("获得列" + i + "所在的Catalog名字:"+ catalogName);
                System.out.println("获得列" + i + "对应数据类型的类:"+ columnClassName);
                System.out.println("获得列" + i + "在数据库中类型的最大字符个数:"+ columnDisplaySize);
                System.out.println("获得列" + i + "的默认的列的标题:" + columnLabel);
                System.out.println("获得列" + i + "的模式:" + schemaName);
                System.out.println("获得列" + i + "类型的精确度(类型的长度):" + precision);
                System.out.println("获得列" + i + "小数点后的位数:" + scale);
                System.out.println("获得列" + i + "对应的表名:" + tableName);
                System.out.println("获得列" + i + "是否自动递增:" + isAutoInctement);
                System.out.println("获得列" + i + "在数据库中是否为货币型:" + isCurrency);
                System.out.println("获得列" + i + "是否为空:" + isNullable);
                System.out.println("获得列" + i + "是否为只读:" + isReadOnly);
                System.out.println("获得列" + i + "能否出现在where中:"+ isSearchable);
            }
            rs.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}